期刊
BIOCHEMICAL ENGINEERING JOURNAL
卷 51, 期 1-2, 页码 86-93出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bej.2010.05.007
关键词
Ammonia; Biotrickling filter; Composting; Inoculation; Nitrifying bacteria; Odor
资金
- National Science and Technology Pillar Program in the Eleventh Five-year Plan [2006BAJ04A06]
A biotrickling filter (BTF) was used to treat NH3 emitted from the exhaust gases of cattle manure compost. Results of the non-biofilm experiment suggested that NH3 could not be removed effectively only through biofilm adsorption. The absence of NH4+ bio-oxidation resulted in an increase in free ammonia, which had a negative effect on NH3 removal. After biofilm culture, NH3 removal efficiency fluctuated between 67.2% and 94.3% because the presence of a biofilm extended the liquid residence time in the packing. When the biofilm was inoculated with nitrifying bacteria comprised of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), which were screened from a cattle manure solution, the average removal efficiencies became 59.9% and 15.0% higher than those of the non-biofilm and biofilm culture experiments, respectively. AOB and NOB could still oxidize ammonia and nitrite, respectively, even when the free nitrous acid concentration was as high as 37.6 mg/L. With an empty bed retention time of 96.0 s and a removal efficiency of 99%, NH3 elimination capacities were attained at 57.1, 28.6, and 23.7 g-N/(m(3) h) for the first segment, the first and second segment, and the whole BTF, respectively. These results demonstrate that the BTF under study is a viable alternative for the treatment of NH3 during composting. (C) 2010 Elsevier B.V. All rights reserved.
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